The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0.1373 P.One-sixth of this sharp V is truncated at the top and the bottom.Symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane).The thread form follows the British Standard Whitworth standard: (In Europe, taper female pipe threads are not commonly used.) Longscrew threads These are parallel pipe threads used where a pressure-tight joint is achieved by the compression of a soft material (such as an o-ring seal or a washer) between the end face of the male thread and a socket or nipple face, with the tightening of a backnut. They always use a taper male thread, but can have either parallel or taper female threads. Jointing threads These are pipe threads where pressure-tightness is made through the mating of two threads together. These can be combined into two types of joints: Taper threads, British Standard Pipe Taper thread ( BSPT), whose diameter increases or decreases along the length of the thread denoted by the letter R.Parallel (straight) threads, British Standard Pipe Parallel thread ( BSPP originally also known as British Standard Pipe Fitting thread/ BSPF and British Standard Pipe Mechanical thread/ BSPM), which have a constant diameter denoted by the letter G. It has been adopted as standard in plumbing and pipe fitting, except in North America, where NPT and related threads are used. For the 7-bit coded character set, see ISO/IEC 646.īritish Standard Pipe ( BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external ( male) thread with an internal (female) thread.
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